Hybrid tactile probe for damage detection and material recognition

Nicolo Savalli; Salvatore Baglio; Giovanni Muscato; Michel B. Lemistre; Daniel L. Balageas

doi:10.1117/12.484451

1 August 2003 Hybrid tactile probe for damage detection and material recognition

Nicolo Savalli, Salvatore Baglio, Giovanni Muscato, Michel B. Lemistre, Daniel L. Balageas

Proceedings Volume 5047, Smart Nondestructive Evaluation and Health Monitoring of Structural and Biological Systems II; (2003) https://doi.org/10.1117/12.484451
Event: NDE for Health Monitoring and Diagnostics, 2003, San Diego, California, United States

Abstract

Two health monitoring systems for damage detection in composite structures have been developed. First, a magnetic probe measures the magnetic field reflection during a frequency exploration. The local electrical conductivity of the structure is deduced from the cut-off frequency of the transfer function. Secondly, a probe with piezoelectric elements analyzes the local visco-elastic response of the structure produced at the moment of touching and stressing it. The same piezoceramic elements induces the mechanical solicitation and senses the response signal. The probes are compared in the analysis of damages induced in a coupon of quasi isotropic Carbon-epoxy material by various aggressions: 4 J- and 2 J-impacts inducing delaminations, a local burning by contact with a hot body and a simulated lightning impact by electric spark. Both probes show sensitivities to these various types of damage. For the piezoelectric probe, a "real-time" strategy, based on the processing of spectral power densities of the sensor signals, leads to an automatic measuring system classifying the damages. A software, based on fuzzy logic and implemented on a dedicated micro controller, elaborates the input data in order to realize the material damages classification. Combination the two techniques in a hybrid probe and use of the fuzzy logic procedure to the full signals to classify the structure response in a more subtle and extended way is the starting point of the design of a multisensor tactile probe able to recognize damages for a given material (NDE) or several classes of materials (robotized examinations in hostile environments).

Citation Download Citation

Nicolo Savalli, Salvatore Baglio, Giovanni Muscato, Michel B. Lemistre, and Daniel L. Balageas "Hybrid tactile probe for damage detection and material recognition", Proc. SPIE 5047, Smart Nondestructive Evaluation and Health Monitoring of Structural and Biological Systems II, (1 August 2003); https://doi.org/10.1117/12.484451

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